How many "experts" on this thread have actually trained at a serious level themselves?
The transformation in JMM is possible without PEDs. I'm not a professional athlete committed to my sport 24/7 and I could do it with strict diet and a precise training schedule. In terms of boxers, PEDs are a shortcut but you can get to the same place physically with hard graft and discipline. Now competition bodybuilders who freak up is a different topic all together.

you think you could do what exactly??

and no you cant get to the same place whilst being clean against someone who is cycling on, the benefits are a lot more than what you think

Have to disagree, JamieC. Sure, he improved on his conditioning and the look of his body, but by and large the main difference was the style he was up against. A style (Pacquiao's) he matches against better than anyone else.

He was much stronger and able to use his legs to stay out of range, which he wasn't able to do that much against Casamayor, Diaz and Katsidis.

My point remains though, you certainly don't need PED's to see a physical improvement like that JMM currently exhibits.

I personally as well as several others I know have put on a lot of muscle whilst staying lean and none of have used drugs to do so.

your point is flawed mate, big difference in training with weights to look good and boxing training

marquez whilst putting on a lot of muscle has kept his skill, speed, agility etc. He doesnt go to the gym and lift weights like you, he trains to box on a low calorie diet to make weight, if you take into account all these factors and for it not to impact his boxing then you need performance enhancers